Masayuki (岩坪正之) Iwatsubo
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Born : 1979
Cat. M45 Ultrarunner since 2013
5
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
17
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?Japan
Japan49,9%
Rank quotient ?This runner's calculation uses 5 eligible race(s): Σ(rank − 1) = 1 463; Σ finishers = 2 931. 1 463 / 2 931 × 100 = 49.91%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed5
Km — ultra races352 km
Longest race100,0 km
7th OSJ Ontake 100km Ultra Trail — 19/7/2014
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road34,7%
Trail65,3%
Records
HISTORY
5 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2016 | ||||
| 16.07 | 65km | 7th Nozawa Onsen 4100D Mountain Trail |
11:12:58 h | 96 |
| 2015 | ||||
| 19.07 | 65km | 6th Nozawa Onsen 4100D Mountain Trail |
11:30:20 h | 103 |
| 2014 | ||||
| 19.07 | 100km | 7th OSJ Ontake 100km Ultra Trail |
16:50:06 h | 573 |
| 20.04 | 72km | 24th Fuji 5 Lakes 72 km Challenge |
10:19:20 h | 569 |
| 2013 | ||||
| 29.09 | 50km | 1st 50 km Ultramarathon Hakusan-Shirakawago |
5:56:59 h | 127 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 19/7/2014 | 7th OSJ Ontake 100km Ultra Trail | 100,00 | ×5 |
| ✓ 2 | 20/4/2014 | 24th Fuji 5 Lakes 72 km Challenge | 72,00 | ×4 |
| ✓ 3 | 16/7/2016 | 7th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×3 |
| ✓ 4 | 19/7/2015 | 6th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×3 |
| ✓ 5 | 29/9/2013 | 1st 50 km Ultramarathon Hakusan-Shirakawago | 50,00 | ×2 |